Eugen's Solution to

Tilted Capacitor Plates

[@YagyanshDixit]

Love from india sir i am completing my syllabus of physics for neet by your lectures they are helping me alot i wish you come to india and teach physics i love the way you teach i want to meet you once in my life ❤

[@lecturesbywalterlewin.they9259]

I have been 4 times in India. During my last 2 week visit in 2014 I gave 8 lectures at different colleges. The trip to and from India is very exhausting. In addition the air polution in big cities is very unhealthy. My medical team therefore does not want me to go back to India.

[@YagyanshDixit]

​​@@lecturesbywalterlewin.they9259oh so sad for me but sir if you can't visit then can you please clear my doubts online I will ask in your video comment section the question and if you can spend your precious time for clearing the doubt I would be very glad of you and after clearing my neet exam I will meet you sir. I am your big fan live long sir !!

[@ASH-if6us]

​@@lecturesbywalterlewin.they9259thats very sad to hear sir... and yes cities in india have highly poluted air.... so its best if u dont come here any time soon.... take care of your health sir... looking at a legend like u becoming old and sick day by day is breaking my heart.... may u live a 100 other healthy years my good sir

[@user-sp1st9zm5r]

@@lecturesbywalterlewin.they9259 sir but you are coming for tekriti in IIT Kanpur in mid march ,we will be very deighted by your presence

[@anushka17nov03]

I pray for your long life and hope that you keep giving us beautiful lectures in future as well ! We love you sir !! ❤

[@lecturesbywalterlewin.they9259]

So nice of you

[@RisetotheEquation]

During my MIT days in the 90s my research hinged on Huygen's principle since we were building phased array transducers to detect cracks and defects in civil engineering structures.

[@zawizarudo7295]

Lots of love from India sir. Your lectures have helped me a lot. I pray for your lobg life

[@lecturesbywalterlewin.they9259]

So nice of you

[@mostafakheder7721]

Great to see you in a good health ❤❤ Prof Walter

[@katherine-zg7mg]

Hello sir I'm Pallavi from India and my neet exam is going to be conduct on 5th may and believe me sir you are legend not because of your knowledge but the way you explain I'm learning more about physics from your old lectures which makes me think that how lucky they are while having you as a teacher I wish you a happy and beautiful life and thank you from our bottom of heart for making physics a beautiful subject ❤❤❤❤ love from India

[@lecturesbywalterlewin.they9259]

All the best

[@katherine-zg7mg]

@@lecturesbywalterlewin.they9259 sir you are awesome you made my day thanks for your wishes sir waooooo. I can't imagine walter lewin....The walter lewin professor of MIT waoooooooo

[@KunalThakur0909]

Indians=90% Forgiener=10% Love you sir ❤❤

[@animefan7173]

AYY PROFESSOR LEWIN!!! YOURE REALLY GREAT AT TEACHING!!! I WILL WATCH UR VIDEOS WHILE PREPARING FOR JEEE

[@user-lo9ur1lf1v]

1st love form India sir😁🙌

[@ayush_panwar18113]

I didn't expected 😅

[@Moayad8705]

A while ago, I watched you give a lecture - you were younger 😅 - about the electric field. You solved many of my problems. I am sad because I see you growing up.. Thanks man

[@VOID_Xtra]

I'm a indian high schooler I liked your lectures very much How can anyone teach like you🍃

[@nearbear_]

Happiest Birthday sir ❤ hope you enjoy your rest life and live happily ☘️🍀

[@abdi-azisabdirahman4787]

It will better to me one of your students in MIT course, really I like very much the expectation, movement, vision expression for that content. And your continuation till now sir. from Somalia🇸🇴

[@NeerajKumar-ft8pk]

Love you from India sir.

[@DmaestroErwin]

I was named after Erwin Schrodinger, the love of Physics comes in many forms. Mine, now, is to teach. You're the best lecturer I have ever seen. Supassing Feynman. If you have time, I would love a personalised copy of your book :)

[@lecturesbywalterlewin.they9259]

Before you decide to buy a book from me *I strongly suggest you get a free copy using the pdf file.* fiisikis.weebly.com/uploads/5/4/9/3/54939617/for_the_love_of_physics.pdf You should also consider to buy my book at amazon in your country. *I have been told that in India you can get my book from Amazon and Flipkart for $4.50* These books do not contain the 15 colored photo index (that's why they are so cheap); the pdf file does not include that either. If you can afford it, of course, I am willing to send you a signed copy of my book with *a special note for you + a signed picture of me, which will also have your name on it,* but the price is high as I pay 30% tax here in the US of your payment. Ofcoz the book that I send you contains the photo index. Your total costs for 1 paperback copy + a signed copy of my picture: US $40; Europe, South America, Brazil, Canada, Pakistan, Nepal, Bangladesh Tanzania & India $65; Middle East & Asia: Japan, Philippines, China, Thailand & Australia $80. I make zero money on these sales, I sell them for what they cost me. You should transfer the money to my PayPal account (see below). Please let me know in PayPal your name and complete address and *which name I should use for my note in your book and on my picture.* *For those of you who only want a signed copy of my picture, swinging from the pendulum,* with your name on it as well, it will cost you *$13 for 1 copy* (that includes postage). It's the same price for all countries. *You should send me on PayPal your complete address and the name you want me to write on the picture.* Please transfer the $13 to my PayPal account which is [e-mail]. *Keep in mind that you must first enter PayPal and then my account.*

[@DmaestroErwin]

@@lecturesbywalterlewin.they9259 Aren’t you simply the best!? Well, I look at it this way. I am nothing without your teachings. I got into several prestigious institutions but that is not the start of SITH Industries. It’s simply the beginning. I will write this message in one go. As I do with things in life. I lived 8 dark years and will send you a more personalised message if I had the means. The idea has always been simple. Not having a degree due to and onset of schizophrenia. But I have found my vocation in teaching and writing. Being enrolled at an institute like Imperial College London and Oxford gives one the ability to explore. I just landed an elite tutorial position solely due to the lack of a degree. So, who am I to judge? I can understand it, Prof. Lewin. I really do understand what feels like a rock bottom. But there is more to life than depression. There is more to depression than antipsychotics. There is more to everything. Life isn’t so bad, is it? For where there is life there is hope to transcend. And where there is hope to transcend, SITH industries keeps a close watch. I will get that book signed and no matter what the media tells me, the truth is that Feynman would be proud that this man, Walter Lewin, explains Physics better than he does. 😁

[@SkyLightsUXOs]

The earlier schematics make me think of the Grand Gallery in the Great Pyramid....

[@alchemy-is-official]

Respected sir I am a 10th grade student from India and I am going to give my physics examination on coming monday which is one of the most important examination of my life. I have been really inspired by your teaching to focus on concept and never on learning physics just i have a request to kindly bless me Thankyou sir Regards Aditya

[@lecturesbywalterlewin.they9259]

All the best

[@Supes38]

I am gonna revise my entire physics syllabus by watching your lectures. My NEET exam is going to be conducted soon after 2 months. My biology and chemistry are prepared, but i was not able to study and give time for physics, but i guess, anything is better than doing nothing.

[@omedmiro9158]

God bless you

[@geg-zc8vg]

Thanks for the video, greetings from Russia

[@bibeksubedi2909]

Love from nepal sir❤🎉

[@pranavsharma5184]

@lecturesbywalterlewin.they9259 Sir, the proper solution is not mentioned anywhere. My doubt is specifically regarding two capillary tubes placed above one another. In case of insufficient length of one tube, will the water rising in the tube will cross the interface or would the meniscus adjust it radius on the interface for balance?

[@Nano0161]

Sir what did you think about that going in gaza?

[@surendrakverma555]

Thanks Sir

[@cps.31]

Sir Ashu sir the physics teacher in india youtuber is inspired by yoi❤

[@pranavsharma5184]

Hello Sir, please answer this query of mine. Can the contact angle of capillary tube change from the specified value in the intermediate state of rising up? (Query from JEE Advanced 2019 Paper 2 question)

[@ZeEingozuBa]

Congrats to Eugen!!!

[@korelgokce4008]

İyi ki bilen birileri var ve daha iyi ki o , sizsiniz dear Walter LEWIN ...🥰

[@ProminentPerspectives2]

Lewin Sir, I also want the glasses which you wore. How to get it?, because I love this frame.

[@lecturesbywalterlewin.they9259]

they are designed by Theo - they cost $450. I bought them in Antwerp (Belgian) but Theo frames can also be bought in the US.

[@10kneedurgently]

You even didn't change that pendulum type of thing behind yours how many years 😭

[@gaganubiradar1103]

Dear Professor Lewin, I am planning to attend Hack MIT this year and would love to meet you in person. I'm eager to catch a glimpse of you.

[@MANABENDRA06]

SIR, I AM BIG FAN OF YOURS, LOVE FROM INDIA!❤

[@lecturesbywalterlewin.they9259]

Wow, thanks

[@devi100688]

Sir Good Evening, I Am Your Big Fan of Your Teachings or Lecture,i am facing a problem to calculate frequency in terms of time to identify its purity in form of Area,Mostly Used in Drug identification.I will be thankful for your response.❤

[@mohamadalimokadem1375]

Hello professor, I was thinking of using infinitesimal steps and integratimg when I saw the problem, but my question is can we still consider that we have small capacitors, because to get the expression of the capacitance we consider an infinite plate and an electric field which is perpendicular to the plates, but if we take delta(y) as the height of the capacitor, how can we justify using the same formula while our system is more similar to two parallel wires instead of plates?

[@KeithandBridget]

It's not two parallel wires, there is no gap in between them. The key assumption is parallel field lines.

[@mohamadalimokadem1375]

​@@KeithandBridgetGot it, thank you very much

[@shrawasti798]

I'm in IIT now and I just remembered watching your lectures when I'd prep for my jee exam, feels good to see you inspiring more people ✨

[@keineyy]

Hello professor , i am from India and i am a huge fan of yours .you are an inspiration for all of us . Our teachers makes us cram and learn physics while watching your videos i understand them . i really wish to meet you someday , but really have no clue where can i meet you ?

[@lecturesbywalterlewin.they9259]

I meet with students in Cambridge, MA USA. But I have to know 2 weeks in advance when you will be there.

[@Krishna-sn3lj]

Dear sir , Q. When speed limit is fixed which is apx.≈C .A/c to ''Theory of realitivity'' time almost stop when we approch speed ≈C .In other word, we can maximum travel apx.3lakh in one second but in other hand we can travell almost infinite distance without losing any time (when we approch speed of light)how its possible ??? Please fix my doubt....❤❤❤

[@lecturesbywalterlewin.they9259]

yes time stands still for light and all radiation that moves with speed c

[@Krishna-sn3lj]

Sir my exact ques. is we can maximum travell in one second ≈3 lakh but also we can travell infinite distance without losing any time when speed ≈C how both term will true ???please correct me ❤😢

[@lecturesbywalterlewin.they9259]

@@Krishna-sn3lj no particle (thus with rest mass) can travel with the speed c. Only massless particle (like light *must* do that.

[@michaelbruning9361]

I watched both solutions and think the derivations are a bit awkward and strange. If the plates have an angle theta and the electric field lines end up perpendicular to the plates you get for the length of the field lines in a distance h the value d + h * theta and for the capacitance C = e0 * integral from 0 to sqrt(A) [sqrt[A] / (d + h * theta) dh ( same integral which is mentioned in the solution previously as aproximation ).

[@KeithandBridget]

The key thing is to "assume" parallel field lines, which you also do for a parallel plate capacitor of finite dimensions, so ignoring edge effects. Once you do that we all end up at the same approximation, possibly by different routes. If the field lines are really not parallel we end up using a mathematical technique called conformal mapping, to make them appear parallel, which is way way way more involved!

[@michaelbruning9361]

@@KeithandBridget I think, if the plates have an angle > 0°, the field lines are curved (it has to be that way) and i do not need this approximation with small parallel plates or conformal mapping. Whether the exact form of the field line curve is a part of a circle + straight line, i don't know and Walter Lewin mentioned nothing about this, but this way of thinking is easier and not worse either.

[@ItachiUchiha-tu1lg]

4 march is my physics exam please sir make one shot video for all the chapter 😅😂

[@chanchalchaudhary1098]

Hello sir I am from india.my iit jee exam is going to conduct on 27 may ..sir ur way of teaching is wow 😃 love u sir ...

[@lecturesbywalterlewin.they9259]

All the best

[@anime-eo7lg.]

❤❤❤love physics ❤

[@keineyy]

sir thank you so much for replying , where can i inform you about coming to USA , via email ?

[@lecturesbywalterlewin.they9259]

you can only do that here

[@MusaShah-qh5jr]

Thanks from pakistan😊😊

[@lecturesbywalterlewin.they9259]

My pleasure 😊

[@Blockrix]

What a genius...no comments, I'm want to give you my respect (i hope i spell it right)

[@JackyViper]

After watching you I just got a Different vibe because you're type of teachers are like we all wanted in India sir but the problem is our whole Indian Educationa system sucks, especially CBSE and can i ask what's your age.

[@lecturesbywalterlewin.they9259]

stone age

[@JackyViper]

@@lecturesbywalterlewin.they9259😅

[@trickyepithet9122]

Just use google bruhh

[@studytosuccess6501]

What sparked the existence of the universe? If we consider the Big Bang theory, what led to this monumental event?as it's also theoretical then we actually don't know...

[@lecturesbywalterlewin.they9259]

it is not known what there was before the big bang but there may have been an infinite number of Universes. The net energy of a universe may be zero as mass has positive energy but gravitational fields have negative energy.

[@studytosuccess6501]

@@lecturesbywalterlewin.they9259 why gravitational fields have negative energy

[@lecturesbywalterlewin.they9259]

@@studytosuccess6501 take a charged sphere - try to collapse it, when you make it smaller *you have to do positive work* as the charges repel each oher - the more you collapse it the stronger will the E-fields become near it's surface. Thus you have created E-fields where there were no E-fields before. That's why E-fields contain positive energy. Now take a sphere of mass. Collapse it - that will take negative energy for you as gravity wants to contract the sphere. The gravitational field at its surface will get large and larger as you collapse it more. Thus the field that you have created has negative energy. *The charged sphere (left alone) wants to expand; the mass sphere wants to contract.*

[@studytosuccess6501]

Thank you 😊 got it ...I love physics..I keep thinking about many things so most of the times my brain is filled with lots of questions..can I ask all those

[@KeithandBridget]

@@lecturesbywalterlewin.they9259 Walter, Sir, you have a knack of, in just a few words,giving me lots to think about. Somehow you do it in every lecture too.

[@user-qj5kt3si2d]

hello sir good morning

[@AnsarKhan-gh9wf]

Love from Pakistan ❤

[@tanishqu]

☠️

[@maanu_bisht]

Sir, one day I'll meet you at MIT after clearing jee... Im going to be in 11th grade this year...

[@lecturesbywalterlewin.they9259]

good luck

[@MohamedAhmed-hu9jk]

Hello , i hope you good

[@1234-at]

Sir your 80.1 videos discription doesn't open

[@lecturesbywalterlewin.they9259]

kzbin.info/www/bejne/ioK1Z4mhjt90m7s

[@saurabhmanral8147]

Sir i have a small problem that i can't solve could you please tell me where I can ask the problem.

[@lecturesbywalterlewin.they9259]

you can ask here after you have made serious efforts to get the solution from "google"

[@saurabhmanral8147]

Yes sir, I went through numerous books lectures but didn't help so far. Its simple version is easy but just introducing friction is complicating the question. I am trying to solve it from past 3 months with each time getting confused. Please go through the link to see the problem. Thanks you replied. Part (c) is challenging to me. docs.google.com/document/d/1i9GR92pU4yJ5zEUPpDBGdfhVXHcOmyl1QAmhsrWpEyM/edit?usp=sharing @lecturesbywalterlewin.they9259

[@saurabhmanral8147]

Yes sir, I went through numerous books lectures but didn't help so far. Its simple version is easy but just introducing friction is complicating the question. I am trying to solve it from past 3 months with each time getting confused. Please go through the link to see the problem. Thanks, you replied. Part (c) is challenging to me. docs.google.com/document/d/1i9GR92pU4yJ5zEUPpDBGdfhVXHcOmyl1QAmhsrWpEyM/edit?usp=sharing

[@saurabhmanral8147]

Any update sir ​ @lecturesbywalterlewin.they9259

[@saurabhmanral8147]

Sir, please go through this 🙏

[@Lakshya_764]

Is it easier to pull the object or is it easier to push the object? Can anyone gimme the answer of this with reason

[@Krishna-sn3lj]

Pull 😅 simply you can break forces in component then you simply understand.

[@Lakshya_764]

Pull=push? Is that's isn't equal?

[@PhosPhorus3805]

Sir can I crack neet in just 2 months 😢😢

[@Barvinski]

Wow! Super!!

[@shivasai9739]

First comment sir ❤

[@user-vn6vp8er1u]

Its my birthday 24/2

[@The_Green_Man_OAP]

Hello again ☺️. Btw, Taylor's series for ln(1+x)≈x-½x², Thus, for √A·θ«d: C≈(ε₀√A/θ)(√A·θ/d -½(√A·θ/d)²) =(ε₀A/θ)(θ/d)(1 -½(√A·θ/d)) →ε₀A/d, as θ→0. Didn't need e^x ... |. / |. / |θ / ⟨d⟩ |. | |. | |0°| ⟨d⟩

[@teamab3523]

Can you dub all your lecturers in Hindi?

[@lecturesbywalterlewin.they9259]

dubbing by someone who speaks Hindi takes about 20 hr for one 50 min lecture.

[@teamab3523]

@@lecturesbywalterlewin.they9259 Oo I don't know about it. Sorry sir

[@SAIFBHAIFF]

Sir My Physics is weak 😅 How to Increase my IQ Level

[@lecturesbywalterlewin.they9259]

eat yogurt every day but *never on Fridays* That also worked for Einstein.

[@Rishabhshukla2007]

Sir plz hearted my comment 😊